Wilhelm berkefeld



(No Model.)

W. BERKEPELD. SIMPLE `MEANS EUR SGOURING FILTERS, 50.

Patented Feb. 25, 1890.

UNITED STATES ATnNT Prion.

TILHELM BERKEFELD, OF CELLE, PRUSSIA, GERMANY.

SIMPLE MEANS FOR SCOURING FILTERS, 8:.0.

SPECIFICATION forming part of Letters Patent No. 422,112, dated February25, 1890. i

Application filed June 24, 1889. Serial No. 315,375. (No model.)Patented in Germany March 80, 1889 in Belgium Mayl, 1889, No. 86,152; inFrance May 7, 1889, No. 198,014: in England May 7, 1889, No. 7,609; inItaly June 30, 1889, XXIII,

25,448, L, 265, and in AuStria-Hungary October 9, 1889.

To all whom t may concern; v

Be it known that I, WILHELM BERKEFELD, manufacturer, a subject of theKing of Prussia, residing at Celle, Prussia, German Empire, haveinvented certain new and useful Improvements in Devices for Cleansingand Securing Filters and the like; and I do hereby declare the followingto be a full, clear, and eXact description of the invention, such aswill enable others skilled in the art to which it appertains to make and`use the same, reference being had to the accompanying drawings, and toletters of reference marked thereon, which form a part of thisspecification.

The invention has for its object to provide a simple means for scouringlilters and similar devices; and it consists in the combination, Withthe filtering medium, of a scouring device arranged to operate upon theilteringsurface to cleanse the same of matter deposited thereon in theprocess of iltration; also in means for flushing the filter to removethe impurities removed from the filtering medium, as hereinafter fullydescribed, and set forth in the claim.

In the accompanying drawings, I have shown by a vertical axial section alilter combined with scouring devices and provided with means forflushing out the deposits scoured off the filtering medium a, which inthe example given consists of a vertical cylinder of calcined infusorialearth, closed at bottom and supported at its upper open end in a disk orcircular head b, of any suitable material, as metal, Wood, rubber, the.,the cylindrical iilter being secured to said head l) in any suitable ordesired or appropriate manner. The head b is screw-threaded exteriorlyand has a flange b', that is seated upon the upper open end of acylindrical casing d, into the upper end of which the head is screwed,so that the filter a is suspended within the casing d, which casing isof greater length and diameter than the filter, so as to leave ampieroom for the scouring devices and for the circulation of the liquidaround said filter.

g indicates the cover proper for the cylinder d, which is provided withan outlet branch g', and bolted by means of bolts d to suitable lugs orears formed on the cylinder d and not shown in the drawings; and f isthe inlet branch of said cylinder d.

To the lower end of t-he cylinder d is screwed a Valve-casing c, inwhich is formed a valveseat c for a valve t, that may form an integralpart of the valve-stem 7L, or said valve may be adjustably secured tothe stem by means of a set-screw c', as shown. The casin g has aflushing or discharge branch prand is closed at its outer end by astufling-box h2,

into which screws the enlarged screw-threaded portion m of thevalve-stem 7L, which latter extends through the stutiing-box, itspacking c2, and gland c3, and carries at, its outer end a hand-wheel Z.

To the inner end of the valve-stem 7L is secured a brush-frame 7e, thatcarries a horizontal brusk 7e', in contact with the bottom of the liltera, and a plurality of vertical brushes in contact with the periphery ofsaid filter. It will be readily seen that when the hand wheel Z isrevolved in the proper direction not only will the brushes scour thefaces of the lilter a, but the valve o will be moved off its seat,thereby flushing the cylinder (l, the impurities iowing out at p, sothat lthe operation of the lter need at no time be interrupted byremoval from its inclosing-casc for the purpose of cleansing the same.

Various structural modifications will readily suggest themselves to theskilled mechanic-eas, for instance, any other arrangement of valvecontrolled by the spindle :may be employed. The screw-threadedenlargement of the valvestem may be dispensed with and the thread formeddirectly upon the spindle, according to the relative position of thefiltering and scou ring media. When the filtering medium is arranged asdescribed, I prefer, however, to enlarge that part of the valve-stein,as it affords a more stable bearing therefor.

The filtering medium need not be of the material described, as it mayconsist of any other sufficiently porous material, nor`need saidfiltering medium be of cylindrical form or arranged in a verticalposition, as it may be arranged in a horizontal position; in fact,

the filter muy be inverted, the outlet branch endwsemovable valve-Stein,and scouring p thereof being,` in that case reversed as to its mediaconnected with said stern and in condischarge end p. tactwith thesurfaces of the iltering medium.

Having `described iny invention, what I In testimony whereof I affix mysignature 5 claim, and desire to secure by patent, is in presence of twoWitnesses.

The combination, Qubstantaily as described,

i AI I I' ERKEFELD. wlth :L tubular filtering medium closed at one VIM EDI B end, and its inclosing-casing provided With a IVitneSSes: purgingbranch, of :L vaive interposed be. LYMAN A. SPALDING,

ro tween the branch and casing, arevoluble and D. GURNEY SPALDING.

